1. Important measuring devices in automobiles

2. Speedometer
Tachometer
fuel gauge
water temperature gauge
oil pressure gauge
Oil Temperature Gauge

3. Speedometer

4. The first speedometer was built in 1923 and its basic design didn't change significantly for 60 years.
The job of the speedometer is to indicate the speed of your car in miles per hour, kilometers per hour or both.

5. Types of Speedometers There are two types of speedometers.
mechanical speedometer, or the eddy-current speedometer.
Electronic.

6. How Speedometers Work
To measure the speed of a car, one must be able to measure the rotational speed of either the wheels.
In most cars, measurement takes place in the transmission.
drive cable used to measuring the rotational speed generated by the transmission .

10. Ref: William Harris http://auto. howstuffworks

11. Tachometer

12. Tachometer is designed to give the speed of a rotating part in (rpm)
For car use the tachometer to measuring the speed of the engine

14. Ref :http://www.simonfamily.us/FocusEV/TachSpeedo.htm

15. Fuel gauge

17. Ref :http://auto.howstuffworks.com/fuel-gauge.htm
How Fuel Gauges Work
Ref :

18. water temperature gauge

19. How water temperature gauge Work

21. oil pressure gauge

22. Important of oil gauge
If the oil gauge gives very low reading it means that your oil pressure has dropped.
When the oil pressure drops the oil is not forced into the nooks and crannies .

24. Oil Temperature Gauge